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-rw-r--r--src/test/ui/issues/issue-78720.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/test/ui/issues/issue-78720.rs b/src/test/ui/issues/issue-78720.rs
index 57615d1a207..4cdb9f49113 100644
--- a/src/test/ui/issues/issue-78720.rs
+++ b/src/test/ui/issues/issue-78720.rs
@@ -4,7 +4,7 @@ fn server() -> impl {
 }
 
 trait FilterBase2 {
-    fn map2<F>(self, F) -> Map2<F> {}
+    fn map2<F>(self, f: F) -> Map2<F> {}
     //~^ ERROR mismatched types
     //~^^ ERROR the size for values of type `Self` cannot be known at compilation time
 }